However Walgalu culture was one of three Aboriginal cultural groups identified by Norman Tindale to historically inhabit the area now occupied by the Australian Capital Territory. In his 1974 book Aboriginal Tribes of Australia Norman Tindale, who described language groups as "tribes", had identified that the specific areas where Walgalu speakers lived were the:
Headwaters of the Murrumbidgee, and Tumut rivers; at Kiandra; south to Tintaldra; northeast to near Queanbeyan. Parkes obtained some details from a Wiradjuri man at Brungle under the name Guramal or Gurmal. These notes also apply in part to the Ngarigo. Both tribes were to him ['guarai], or hostile people. The Walgalu spent their summers in the Bogong Mountains ['Bu:ga:?] southeast of Tumut. This tribe was omitted in error from my 1940 work. Mrs. J. M. Flood has drawn my attention to Howitt's note saying that the Walgalu went as far as Kauwambal on the upper Murray River, which she identifies as between Mount Kosciusko and Mount Cobberas. It can perhaps be assumed that they extended their bogong-gathering forays by following the highlands along the eastern border of Djilama-tang territory.
According to Steven Avery, culture group boundaries in southeastern Australia are disputed, due in part to the inexactitude of linguistically assigned boundaries and the uncertainty of historical records. In his 1974 book Aboriginal Tribes of Australia Norman Tindale, who described language groups as "tribes", the dispute over the boundaries of the Walgalu people is typical of the problem.
The Cooma local government website, based on recent research, differentiates between two Aboriginal groups which resided in their region, stating that "the two main groups on Monaro were the Ngarigo people of the tablelands and the Wogul or Wolgalu group in the high country.'"
According to some scholars, the language of the Walgalu is a form of Ngarigo.
Shane Mortimer told the National Indigenous Times in 2012 that Walgalu is a language, and that Ngambri and Ngurmal speak Walgalu.